<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        {{msg}}
    </div>
    <script>
        var vm = new Vue({
            el:'#app',
            data : {
                msg : '张三'
            },
            beforeMount(){
                console.log('挂载之前');
                console.log(this.$el.innerHTML);
            },
            mounted(){
                console.log('挂载之后');
                console.log(this.$el.innerHTML);
            }    
        })
    </script>
</body>
</html>